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                            <h1 class="post-title">Flutter Desktop Mac版(二) 插件初探</h1>
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                        <date class="post-meta meta-date">
                            2019年6月12日
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                                <a href="http://www.kikt.top/categories/flutter">flutter</a>
                            
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                            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span> 阅读</span></span>
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                        <div class="post-content">
                            <p>上篇粗略的查看了一下 desktop 的基本使用, 本篇探索一下插件的使用</p>
<p>环境变量的配置请查看上篇,本篇不再赘述</p>
<h2 id="更新">更新</h2>
<p>继上一篇文章过去了几天, 这个桌面引擎有了一点点的更改: 现在完全用 swift 了,不用 oc 了,无论是 example 还是 plugin 模板都是如此</p>
<p>所以, 为了省事,我重新 clone 了一个仓库, 然后准备用 swift 来创建插件</p>
<p><code>$ git clone https://github.com/google/flutter-desktop-embedding.git flutter-desktop-embedding-2</code></p>
<p>然后分别打开工程和插件 <code>$ code flutter-desktop-embedding-2/example/</code> and <code>$ code flutter-desktop-embedding-2/plugins/example_plugin</code></p>
<p>这个 example_plugin 是给的模板, 最好是复制一份出来</p>
<h2 id="复制插件目录">复制插件目录</h2>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-bash" data-lang="bash">cd flutter-desktop-embedding-2/plugins
cp -r example_plugin math_desktop
code math_desktop
</code></pre></div><p>查看一下目录结构</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-bash" data-lang="bash">tree math_desktop

math_desktop
├── LICENSE
├── lib
│   └── example_plugin.dart
├── linux
│   ├── Makefile
│   ├── example_plugin.cc
│   └── example_plugin.h
├── macos
│   ├── Classes
│   │   └── ExamplePlugin.swift
│   └── example_plugin.podspec
├── pubspec.yaml
└── windows
    ├── ExamplePlugin.vcxproj
    ├── ExamplePlugin.vcxproj.filters
    ├── example_plugin.cpp
    ├── example_plugin.h
    └── scripts
        └── cache_flutter.bat
</code></pre></div><p>基本是约定式的,和移动版的很类似</p>
<p>pubspec.yaml 在根目录,lib 放 dart 文件,然后根据 Platform 的不同使用不同的文件</p>
<h2 id="依赖插件并打开插件">依赖插件并打开插件</h2>
<p>修改 example 文件,添加依赖</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#66d9ef">dependencies</span>:
  <span style="color:#66d9ef">flutter</span>:
    <span style="color:#66d9ef">sdk</span>: flutter

  <span style="color:#66d9ef">cupertino_icons</span>: ^<span style="color:#ae81ff">0.1.0</span>
  <span style="color:#66d9ef">math_desktop</span>: <span style="color:#75715e"># add it</span>
    <span style="color:#66d9ef">path</span>: ../plugins/math_desktop
</code></pre></div><p>然后在 example 目录下执行<code>flutter pub get</code>, 这个是<code>flutter packages get</code>的另一种写法, 比较简单点</p>
<p>接着进入 macos 目录下,执行<code>$ pod install</code></p>
<p>等待完成后 执行 <code>$ open Runner.xcworkspace</code>, 这样正常情况下会用 xcode 打开这个工程</p>
<p>接着出现的就和 iOS 的插件差不多一样了
是这个 SHI 样的:
<img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190612171224.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190612171224.png"></p>
<p>需要简化目录结构的可以搜索我写的 appcode 索引那个文章, 有简化方式,我这里不管它了</p>
<h2 id="编写插件">编写插件</h2>
<h3 id="dart">dart</h3>
<p>插件目录下的 lib 文件夹</p>
<p>添加一个方法</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">  <span style="color:#66d9ef">static</span> Future<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">int</span><span style="color:#f92672">&gt;</span> add(<span style="color:#66d9ef">int</span> a, <span style="color:#66d9ef">int</span> b) <span style="color:#66d9ef">async</span> {
    <span style="color:#66d9ef">return</span> _channel.invokeMethod(<span style="color:#e6db74">&#39;add&#39;</span>, [a, b]);
  }
</code></pre></div><h3 id="swift">swift</h3>
<p>很显然,中间那段是我自己加的,没什么实际意义, 就为了演示而已</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-swift" data-lang="swift"> <span style="color:#66d9ef">public</span> <span style="color:#66d9ef">func</span> <span style="color:#a6e22e">handle</span>(<span style="color:#66d9ef">_</span> call: FlutterMethodCall, result: @escaping FlutterResult) {
    <span style="color:#66d9ef">if</span> (call.method == <span style="color:#e6db74">&#34;getPlatformVersion&#34;</span>) {
      result(<span style="color:#e6db74">&#34;macOS &#34;</span> <span style="color:#f92672">+</span> ProcessInfo.processInfo.operatingSystemVersionString)
    } <span style="color:#66d9ef">else</span> <span style="color:#66d9ef">if</span>(call.method == <span style="color:#e6db74">&#34;add&#34;</span>){
        <span style="color:#66d9ef">let</span> args = call.arguments <span style="color:#66d9ef">as</span>! [Any]
        <span style="color:#66d9ef">let</span> a = args[<span style="color:#ae81ff">0</span>] <span style="color:#66d9ef">as</span>! Int
        <span style="color:#66d9ef">let</span> b = args[<span style="color:#ae81ff">1</span>] <span style="color:#66d9ef">as</span>! Int
        result(a <span style="color:#f92672">+</span> b)
    } <span style="color:#66d9ef">else</span> {
      result(FlutterMethodNotImplemented);
    }
  }
</code></pre></div><h3 id="调用">调用</h3>
<p>在 example 中调用这个方法</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">FutureBuilder<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">int</span><span style="color:#f92672">&gt;</span>(
    future: ExamplePlugin.add(_counter, <span style="color:#ae81ff">5</span>),
    builder: (context, snapshot) {
        <span style="color:#66d9ef">if</span> (snapshot.hasData) {
            <span style="color:#66d9ef">return</span> Text(snapshot.data.toString());
        } <span style="color:#66d9ef">else</span> {
            <span style="color:#66d9ef">return</span> Text(<span style="color:#e6db74">&#39;计算中&#39;</span>);
        }
    },
)
</code></pre></div><p>目前完整的 example 部分的代码如下:</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#75715e">// Copyright 2018 Google LLC
</span><span style="color:#75715e">//
</span><span style="color:#75715e">// Licensed under the Apache License, Version 2.0 (the &#34;License&#34;);
</span><span style="color:#75715e">// you may not use this file except in compliance with the License.
</span><span style="color:#75715e">// You may obtain a copy of the License at
</span><span style="color:#75715e">//
</span><span style="color:#75715e">//      http://www.apache.org/licenses/LICENSE-2.0
</span><span style="color:#75715e">//
</span><span style="color:#75715e">// Unless required by applicable law or agreed to in writing, software
</span><span style="color:#75715e">// distributed under the License is distributed on an &#34;AS IS&#34; BASIS,
</span><span style="color:#75715e">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
</span><span style="color:#75715e">// See the License for the specific language governing permissions and
</span><span style="color:#75715e">// limitations under the License.
</span><span style="color:#75715e"></span>
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/foundation.dart&#39;</span>
    <span style="color:#66d9ef">show</span> debugDefaultTargetPlatformOverride;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:math_desktop/example_plugin.dart&#39;</span>;

<span style="color:#66d9ef">void</span> main() {
  <span style="color:#75715e">// See https://github.com/flutter/flutter/wiki/Desktop-shells#target-platform-override
</span><span style="color:#75715e"></span>  debugDefaultTargetPlatformOverride <span style="color:#f92672">=</span> TargetPlatform.fuchsia;

  runApp(<span style="color:#66d9ef">new</span> MyApp());
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyApp</span> <span style="color:#66d9ef">extends</span> StatelessWidget {
  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> MaterialApp(
      title: <span style="color:#e6db74">&#39;Flutter Demo&#39;</span>,
      theme: ThemeData(
        primarySwatch: Colors.blue,
        <span style="color:#75715e">// See https://github.com/flutter/flutter/wiki/Desktop-shells#fonts
</span><span style="color:#75715e"></span>        fontFamily: <span style="color:#e6db74">&#39;Roboto&#39;</span>,
      ),
      home: MyHomePage(title: <span style="color:#e6db74">&#39;Flutter Demo Home Page&#39;</span>),
    );
  }
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyHomePage</span> <span style="color:#66d9ef">extends</span> StatefulWidget {
  MyHomePage({Key key, <span style="color:#66d9ef">this</span>.title}) <span style="color:#f92672">:</span> <span style="color:#66d9ef">super</span>(key: key);

  <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">String</span> title;

  <span style="color:#960050;background-color:#1e0010">@</span>override
  _MyHomePageState createState() <span style="color:#f92672">=&gt;</span> _MyHomePageState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_MyHomePageState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>MyHomePage<span style="color:#f92672">&gt;</span> {
  <span style="color:#66d9ef">int</span> _counter <span style="color:#f92672">=</span> <span style="color:#ae81ff">0</span>;

  <span style="color:#66d9ef">void</span> _incrementCounter() {
    setState(() {
      _counter<span style="color:#f92672">++</span>;
    });
  }

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <span style="color:#f92672">&lt;</span>Widget<span style="color:#f92672">&gt;</span>[
            Text(
              <span style="color:#e6db74">&#39;You have pushed the button this many times:&#39;</span>,
            ),
            Text(
              <span style="color:#e6db74">&#39;</span><span style="color:#e6db74">$</span>_counter<span style="color:#e6db74">&#39;</span>,
              style: Theme.of(context).textTheme.display1,
            ),
            FutureBuilder<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">int</span><span style="color:#f92672">&gt;</span>(
              future: ExamplePlugin.add(_counter, <span style="color:#ae81ff">5</span>),
              builder: (context, snapshot) {
                <span style="color:#66d9ef">if</span> (snapshot.hasData) {
                  <span style="color:#66d9ef">return</span> Text(snapshot.data.toString());
                } <span style="color:#66d9ef">else</span> {
                  <span style="color:#66d9ef">return</span> Text(<span style="color:#e6db74">&#39;计算中&#39;</span>);
                }
              },
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: <span style="color:#e6db74">&#39;Increment&#39;</span>,
        child: Icon(Icons.add),
      ),
    );
  }
}

</code></pre></div><h3 id="运行代码">运行代码</h3>
<p>这里会发现这种错误</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-bash" data-lang="bash"><span style="color:#f92672">[</span>ERROR:flutter/lib/ui/ui_dart_state.cc<span style="color:#f92672">(</span>148<span style="color:#f92672">)]</span> Unhandled Exception: MissingPluginException<span style="color:#f92672">(</span>No implementation found <span style="color:#66d9ef">for</span> method add on channel example_plugin<span style="color:#f92672">)</span>
</code></pre></div><p>首先我在 <code>MathDesktop</code> 类的注册方法中加入了 NSLog 的日志, 发现并没有输出, 所以应该是插件没有注册的原因</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-swift" data-lang="swift"><span style="color:#66d9ef">public</span> <span style="color:#66d9ef">static</span> <span style="color:#66d9ef">func</span> <span style="color:#a6e22e">register</span>(with registrar: FlutterPluginRegistrar) {
  <span style="color:#66d9ef">let</span> channel = FlutterMethodChannel(name: <span style="color:#e6db74">&#34;example_plugin&#34;</span>, binaryMessenger: registrar.messenger)
  <span style="color:#66d9ef">let</span> instance = MathDesktop()
  registrar.addMethodCallDelegate(instance, channel: channel)
  NSLog(<span style="color:#e6db74">&#34;初始插件 : example_plugin&#34;</span>)
}
</code></pre></div><p>据我观察并测试后, 原因是: 虽然迁移到了 swift, 但是相应的脚本或者说 flutter 的工具链没有迁移, 所以还是用的 oc 文件来注入, 但 oc 文件未被纳入到 flutter 项目中, 所以暂时还没法通过 flutter packages get 来自动引入原生的 plugin</p>
<p>所以需要手动修改<code>example/macos/Flutter/GeneratedPluginRegistrant.swift</code>文件,来注册插件</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-swift" data-lang="swift"><span style="color:#66d9ef">import</span> <span style="color:#a6e22e">Foundation</span>
<span style="color:#66d9ef">import</span> <span style="color:#a6e22e">FlutterMacOS</span>
<span style="color:#66d9ef">import</span> <span style="color:#a6e22e">math_desktop</span>

<span style="color:#66d9ef">func</span> <span style="color:#a6e22e">RegisterGeneratedPlugins</span>(registry: FlutterPluginRegistry) {
    MathDesktop.register(with: registry.registrar(forPlugin: <span style="color:#e6db74">&#34;math_desktop&#34;</span>))
}
</code></pre></div><p>这样再次运行,就不会再报错了</p>
<p>可以得到正确的效果</p>
<p><img src="https://dev.azure.com/cjlspy/844861b8-ee45-48a3-b430-b974684baaaa/_apis/git/repositories/bf4da1c1-1cfa-4f54-8a75-745cce2b737c/items?versionDescriptor%5Bversion%5D=master&amp;path=%2F20190613085127.png&amp;versionDescriptor%5BversionOptions%5D=0&amp;versionDescriptor%5BversionType%5D=0&amp;resolveLfs=true&amp;%24format=octetStream&amp;api-version=5.0" alt="20190613085127.png"></p>
<h2 id="简单总结">简单总结</h2>
<p>通过插件的编写, 简单总结一下:</p>
<ol>
<li>插件的原生中引入的库不是 iOS 中的 Flutter, 而是 FlutterMacOS</li>
<li>ViewController 的是 Cocoa 框架, 个人猜测不排除未来会变成 SwiftUI 的可能性</li>
<li>注册工具目前不太好用</li>
<li>dart 端几乎无差,但是不排除会有一些特殊的手势或事件(鼠标滑过,键盘监听)</li>
</ol>
<h2 id="后记">后记</h2>
<p>仓库地址: <a href="https://git.kikt.top/kikt/flutter-desktop-mac-example-2">https://git.kikt.top/kikt/flutter-desktop-mac-example-2</a> 目前私有库,后续修改完成后放在 github 上</p>
<p>插件的简单使用就到这里</p>
<p>以上</p>

                        </div>

                        

<div class="post-archive">
    <h2>See Also</h2>
    <ul class="listing">
        
        <li><a href="/posts/flutter/desktop/flutter-desktop-1/">Flutter Desktop Mac版(一) 初探</a></li>
        
        <li><a href="/posts/flutter/dart/generators/">dart中的生成器函数</a></li>
        
        <li><a href="/posts/flutter/oc/add-swift-plugin/">flutter 在OC工程中添加swift库报错的问题</a></li>
        
        <li><a href="/posts/flutter/flutter-web/flutter-web2/">Flutter Web 评测第二篇</a></li>
        
        <li><a href="/posts/flutter/dart/2-3-new/">dart 2.3的新东西</a></li>
        
    </ul>
</div>


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